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Can I connect guard ring or chip guard ring to the ground ESD of the chip?

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surianova

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hi all!

can i connect guard ring or chip guard ring to the ground ESD of the chip?

TX
 

guard ring

As long as the connectivity and the functionality of the circuit is not compromised, I think you can connect rings with ESD ground. Infact, it will now have more surface area of large discharge.

SRivats
 

Re: guard ring

hi surianova,

if u hav a noisy block and want to prevent it to effect other block, better split it.
if your block's gnd impedance much lower than guard ring, then guard ring will be useless but this normally not the case.

if your chip has enough pads, split-it is the ideal case. But normally this is the constraint due to the cost.

hope this will help.
 

Re: guard ring

the ideal case whould be to have separate connection for guard ring and logic.
 

guard ring

I would split it if the block within guard ring is noise sensitive.
 

Re: guard ring

for chip guard ring it advise to hv indepent ground pad & downbound to paddle.
 

Re: guard ring

sometimes people put different guard ring for different type of circuit block
 

Re: guard ring

If there is any noise block, you should use back to back diode to connect each block.
If noise level is higher than one diode turn-on vtg, use more series diode.
 

Re: guard ring

I've never seen it done before.
 

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